Heater



FIG. 1 is a perspective view of a heater, showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a top plan view thereof; and,

FIG. 9 is an enlarged perspective view of a portion of the heater taken from FIG. 2 .

The broken lines shown in the drawings are included for the purpose of illustrating portions of the heater that form no part of the claimed design. The dot-dash broken lines in FIGS. 2 and 9 represent the boundary of the enlarged portion and form no part of the claimed design. 

CLAIM The ornamental design for a heater, as shown and described. 